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Using photocoupler for PWM

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adnan_merter

adnan_merter

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hi all,

i am trying to design a circuit that i can control a dc motors speed via usb,
and i need isolate my mcu section from the power section

i tried it with tlp521 photocoupler but it doesnt switch on and switch off rapidly, it is slow.

is there any photocouple i can use, please give me a name,

or can i use photocoupler with pwm?

thanx
 

Re: photocoupler fow pwm

You can get digital photocouplers with up to many MHz switching speed, and you also get special gate driver couplers, that can directly drive a MOSFET or IGBT. Toshiba has both of them, e.g. TLP113 and TLP250.
 
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